(Pre 1.2) Mythril Armor will begin to sparkle when it is sufficiently lit. It will sparkle brighter (more sparkles) the brighter the light source is, and the color of the sparkles (at least initially) depends on the color of the initial light source (it tends towards white, losing some saturation). However, the sparkles can serve as light sources for new sparkles, leading to a positive feedback loop. Within seconds, the armor brightly shines white, even brighter than a torch but with less range. The feedback loop will continue until the player either disables it by removing a piece of the armor or leaves behind enough of the sparkles by moving quickly.

(Pre-1.2) This light-generating effect occurs even if the armor is equipped in the social slots, and can be used in lieu of a Mining Helmet, Shadow Orb, Dual Hook or Fairy Bell. If the light ever dies down all the player needs to do is find a light source - a held or placed Torch, a light-generating tool or weapon, lava, or any number of other things.

(Pre-1.2) The lighting effect is only effective when the player is standing still (the sparkles still light up, but provide very little light).

Mithril is a fictional metal in J.R.R. Tolkien's Middle Earth writings, where it is a rare and high-quality material used for weapons and armor, and a shirt of mithril chainmail is a significant artifact in these writings. It has since become a widely used material in fantasy works, particularly video games.

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